CN1934306A - Hydrophilic nonwovens with low retention capacity comprising cross-linked hydrophilic polymers - Google Patents

Hydrophilic nonwovens with low retention capacity comprising cross-linked hydrophilic polymers Download PDF

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Publication number
CN1934306A
CN1934306A CNA2005800090172A CN200580009017A CN1934306A CN 1934306 A CN1934306 A CN 1934306A CN A2005800090172 A CNA2005800090172 A CN A2005800090172A CN 200580009017 A CN200580009017 A CN 200580009017A CN 1934306 A CN1934306 A CN 1934306A
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China
Prior art keywords
fiber web
fibers
aqueous solution
nonwoven web
web
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Granted
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CNA2005800090172A
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Chinese (zh)
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CN100482883C (en
Inventor
马赛厄斯·施密特
斯蒂芬·A·戈德曼
乔万尼·卡拉拉
埃凯特里纳·A·波诺马伦科
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Procter and Gamble Ltd
Procter and Gamble Co
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Procter and Gamble Ltd
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M14/00—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials
    • D06M14/18—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation
    • D06M14/26—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin
    • D06M14/28—Graft polymerisation of monomers containing carbon-to-carbon unsaturated bonds on to fibres, threads, yarns, fabrics, or fibrous goods made from such materials using wave energy or particle radiation on to materials of synthetic origin of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577—Apparatus or processes for manufacturing
    • A61F13/15804—Plant, e.g. involving several steps
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A61F13/513—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
    • A61F13/51305—Topsheet, i.e. the permeable cover or layer facing the skin characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability having areas of different permeability
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/537—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer
    • A61F13/5376—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15203—Properties of the article, e.g. stiffness or absorbency
    • A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
    • A61F2013/15487—Capillary properties, e.g. wicking
    • A61F2013/15512—Capillary properties, e.g. wicking with specific hydrophilicity
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M2200/00—Functionality of the treatment composition and/or properties imparted to the textile material

Abstract

The present invention relates to hydrophilic synthetic nonwoven webs. At least a region of 1 cm by 1 cm comprised by the web of the invention comprises cross-linked hydrophilic polymers and has a retention capacity of less than 100 g of aqueous liquid per m of the nonwoven fibrous web. Moreover, the invention relates to a method for making such nonwoven webs. Furthermore, the invention also relates to absorbent articles comprising the nonwoven webs comprising cross-linked hydrophilic polymers.

Description

The hydrophilic nonwovens with low retention capacity that comprises the cross-linked hydrophilic polymer
Invention field
The present invention relates to comprise the synthetic nonwoven fiber web of cross-linked hydrophilic polymer.The fibroreticulate reserve capacity of the present invention is that every square metre of nonwoven web is liquid, aqueous less than 100g.
In addition, the invention still further relates to a kind of method for preparing this nonwoven web.
In addition, the invention still further relates to the absorbent article of forming by the described nonwoven web that comprises the cross-linked hydrophilic polymer.
Background of invention
The supatex fabric of being made by synthetic fiber is used to various different purposes, and for example, they often are applied in the absorbent article, for example as top sheet materials or as the accumulation layer of core wrap with the encirclement absorbent core.These supatex fabric are normally hydrophobic.Yet,, need to use hydrophilic nonwoven material for the many application in hygienic articles.Therefore, this supatex fabric must be correspondingly processed.
Making the hydrophilic common method of supatex fabric is the surface that applies nonwoven material with hydrophilic surfactant.Because this coating can not cause between nonwoven material and the surfactant chemical bonding closely, therefore during use when absorbent article is wetted, surfactant may be rinsed.When nonwoven material was coated with surfactant, the liquid minimizing of wet time thoroughly was a kind of desired effects.Liquid is wet thoroughly to be meant that liquid sees through supatex fabric, and the wet thoroughly time of liquid is meant that the liquid of a basic weight sees through the time that nonwoven material spent.Yet because surfactant is rinsed when the supatex fabric of coating is exposed in the liquid, the saturating wet time of next time gushing out is increased again.This causes the diaper be made up of the hydrophobic supatex fabric that surfactant is handled decreased performance in use.In addition, owing to used surfactant, in the wet thoroughly time decreased of liquid, the surface tension of flushing liquor (=contact with the supatex fabric of surfactant processing liquid) reduces.This reducing is worthless, because it can make the seepage of urine in the diaper increase.
The another kind of hydrophilic possibility of supatex fabric that keeps is to use high power treatment, as corona treatment.
Corona discharge is a kind of electrical phenomena, when it betides air and is exposed in the voltage potential that high being enough to cause ionization, thereby it is changed into electric conductor from electrical insulator.
Yet corona treatment causes when storage medium the coating durability low, and promptly hydrophily descends in time.
Therefore, need a kind of hydrophilic coating of nonwoven material, it is difficult for being rinsed when durable, wetting when storage, and it is wet thoroughly to reach quick liquid when repeatedly being exposed in the liquid, reduces and there is significant flushing liquor surface tension.
The method of chemical graft hydrophilic monomer is known in the art.For example title is " Polymericsheet and electrochemical device using the same ", authorizes people's such as Raymond U.S.5,830,604; Title is " Polymeric sheet ", authorizes people's such as Raymond U.S.5,922,417; All mentioned the method for in electrochemical appliance such as battery, making as the nonwoven material of separation member for the WO98/58108 of " Non-woven fabric treatment " with title.
Because unreacted monomer and soluble not graft polymers with relatively large amount, so these chemical graft methods need washing step, otherwise these monomers or polymer can remain on the surface of supatex fabric.If unreacted monomer is not rinsed fully, then they may be rinsed subsequently during use.If this supatex fabric is applied in the absorbent article, this monomer is highly worthless, because they may contact the wearer of absorbent article.If this soluble polymer is not rinsed, then during use they may be the height swelling and/or be rinsed, cause the wet thoroughly time of liquid to reduce.Yet other washing step is relatively costly, especially owing to need necessary processed in a large number washings and dry required energy.
In addition, it is well known in the art making the supatex fabric that comprises super-absorbent polymer.For example, title is the U.S.6 that authorizes people such as Whitmore of " Absorbent article and process for preparing an absorbentarticle ", 417,425 disclose a kind of method, and this method is included in and sprays the blend that comprises super-absorbent polymer particles, forms monomer, initator and the water of superabsorbents on the fiber web.Then this fiber web is stood polymeric reaction condition.
In addition, title is the U.S.5 that authorizes people such as Houben of " Process for producing a water-absorbing sheetmaterial and the use thereof ", 567,478 mention a kind of method of making the suction flaky material, described material is made up of the supatex fabric of water absorbent polymer and preprocessing, the supatex fabric of wherein said preprocessing has permeated the acrylic acid that comprises part neutralization and the solution of at least a crosslinking agent, and be extruded into a certain coating amount, therefore used monomer solution is characterised in that this polymerisation carries out in the presence of radical initiator.Products therefrom it is said water absorption rate and high conservation rate under the load with improvement.
By U.S.6, the nonwoven web of disclosed method manufacturing is intended to have the reserve capacity of increase in 417,425 and U.S.5,567,478.Therefore, the additional content of super-absorbent polymer on fiber web is higher relatively.Yet this nonwoven web is not suitable as top flat or acquisition layer material, because the super-absorbent polymer that this nonwoven material comprises may block fibroreticulate hole easily when the absorption liquid volume expansion, thereby causes the wet thoroughly permeability of liquid to reduce.
Goal of the invention
An object of the present invention is to provide hydrophilic nonwoven web, wherein said hydrophilic coating was difficult for being rinsed when durable, wetting in when storage and can to reach quick liquid when repeatedly being exposed in the liquid wet thoroughly and do not have significant flushing liquor surface tension and reduce.Described hydrophilic nonwoven web should keep the height liquid permeable when contacting with liquid.
In addition, described hydrophilic nonwoven fiber web should not comprise a large amount of unreacted monomers, may be rinsed when these unreacted monomers contact with liquid.This purpose is for being applied to absorbent article with described nonwoven web, and wherein said unreacted monomer especially needs in the time of may contacting with the wearer of absorbent article.
Another object of the present invention provides hydrophilic nonwoven web, and wherein said nonwoven web only comprises the hydrophilic coating of relatively small amount.
Another object of the present invention provides the fibroreticulate method of hydrophilic nonwoven of making.Described method should be suitable for high speed processes, as making the production line of nonwoven web.Therefore, expectation provides a kind of hydrophilic coating, and wherein said method does not need washing step.In addition, described method should obtain hydrophilic nonwoven web, and it satisfies above-mentioned target.
Summary of the invention
The present invention relates to a kind of synthetic nonwoven web, it comprise at least one be of a size of 1cm take advantage of 1cm, reserve capacity be every square metre of described nonwoven web less than the liquid, aqueous zone of 100g, and wherein this zone comprises the cross-linked hydrophilic polymer.
The invention still further relates to the fibroreticulate method of a kind of processing synthetic nonwoven, wherein said method may further comprise the steps:
A) provide synthetic nonwoven web or plurality of fibers is provided;
B) provide the aqueous solution that comprises hydrophilic monomer, cross-linker molecules and radical polymerization initiator molecule;
C) described fiber web or plurality of fibers are contacted with the described aqueous solution, make the described aqueous solution permeate described fiber web or plurality of fibers;
D) described fiber web/plurality of fibers is exposed to ultraviolet radiation;
Wherein select the concentration of monomer in the described aqueous solution, make the additional content of described hydrophilic polymer on described nonwoven web or plurality of fibers by the described fiber web that does not contain polymer or plurality of fibers weight less than 30%.
The accompanying drawing summary
Though this specification can be understood the present invention to point out and clearly claimed claims of the present invention are drawn a conclusion, to it is believed that by the following drawings better in conjunction with the explanation of enclosing, wherein same assembly is represented with identical reference number.
Fig. 1 is the top plan view of disposable diaper, and it is partly cut away at the middle and upper levels.
Fig. 2 is the sectional view along disposable diaper axis of pitch shown in Figure 1.
Detailed Description Of The Invention
Definition
Following term used herein has following implication:
" absorbent article " refers to absorb the device with receiving fluids. In one embodiment, term " absorbent article " refers to be close to or contiguous wearer's body is placed to absorb and held from health and gives off The device of various exudates. Absorbent article includes but not limited to diaper, adult-incontinence short underpants, instruction Practice trousers, napkin holder and lining, sanitary napkin etc. In addition, at another as described in the present invention In the embodiment, term " absorbent article " refers to cleaning piece.
Term used herein " disposable " is used for describing does not generally plan to be washed, and in other words one As do not plan the goods that recover or reuse, namely they once namely are dropped afterwards using, and preferred Ground can recycling, compostable or process in the mode of environmentally compatible.
" comprise " or " comprising " is a kind of unconfined term that it specifies described for example one thereafter The existence of component, but do not get rid of further feature known in the art or disclosed herein, element, step Or the existence of component.
Term " hydrophilic " has been described the aqueous fluid that is deposited on these fibers (such as, water content Liquid) wetting fiber or fiber surface. Hydrophily and wettability are typically for example logical according to fluid The contact angle and the thoroughly wet time that cross supatex fabric define. What edited by Robert F.gould Name is called the American Chemical of " Contact angle, wettability and adhesion " In the Society publication (copyright 1964) this has been carried out at length discussing. When fluid and fiber or Contact angle between its surface is less than 90 °, or is tending towards spontaneous fiber when spreading on the fiber surface when fluid Or fiber surface it is said that by fluid wets (that is, hydrophilic) these two kinds of situations normally coexist. Phase Instead, if contact angle greater than 90 ° and fluid can not be on whole fiber surface spontaneous sprawling, then fine Dimension or fiber surface are considered to hydrophobic.
Term " supatex fabric " and " non-woven webs " are used interchangeably.
Term " plurality of fibers " refers to many independent fibers or long filament, and it not yet changes into non-woven Fleece. Yet fiber can be entangled to each other. In a preferred embodiment of the invention, many Fiber is made up of continuous filament yarn.
Supatex fabric
Supatex fabric passes through friction and/or bonding and/or adhesion for the fiber of orientation or arbitrary orientation Bonding or by wet grinding and the Art Ross net of felting does not comprise paper and by weaving, compiling Knit, bunch one-tenth, loop bonding and merge yarn or the continuous yarn product of constraint, do not consider whether stitched in addition.
Fiber can be natural or artificial source. They can be short fiber or continuous filament yarn or can be with regard to landform Become.
Supatex fabric can form such as meltblown, spun-bond process, carded method in many ways. Non-woven The basic weight of fabric is usually with every square metre grams (g/m2) expression.
The diameter range of commercially available fiber be less than about 0.001mm to greater than about 0.2mm, and they have several different forms: staple fibre (being called staple fibre or staple fiber), filament (long filament or monofilament), non-twist continuous long strand (tow) and twist continuous long strand (yarn) continuously.Fiber is classified according to their source, chemical constitution or the two combination.For example, they can be made into fabric (being also referred to as nonwoven material, nonwoven web or supatex fabric).
Supatex fabric can comprise the fiber (natural fabric) of natural generation, artificial fiber (synthetic fiber), or their combination.The embodiment of natural fabric includes but not limited to: animal fiber such as wool, silk, fur and hair; String such as cellulose, cotton, flax, linen and hemp; And some naturally occurring mineral fibres.
Be used for when of the present invention, described supatex fabric synthesizes.Synthetic fiber are artificial fibres, and it comprises the fiber that derives from natural origin and mineral source.The exemplary synthetic fiber that derive from natural origin include but not limited to viscose, polysaccharide (as starch, artificial silk and lyocell fiber).The exemplary fiber that derives from the mineral source includes but not limited to polyamide fiber, as polypropylene, polyethylene fiber peacekeeping polyester.The fiber source that derives from the mineral source is in stone and silicate fiber such as glass and asbestos.
Nonwoven web can be shaped by direct extrusion molding, is asking to join one time point shaping just at shaping fiber and net; Perhaps can be shaped at the preform fibre method that the time point that obviously lags behind is spread in the network access by fiber after fibre forming.Exemplary direct extrusion method includes but not limited to: spun-bond process, meltblown, solvent spinning, electrostatic spinning, and their combination.Which floor nonwoven web generally includes, and it can be for example by different extrusion method manufacturings.
Term used herein " spun-bonded fibre " is meant small diameter fibers, and this fiber forms by extruding molten thermoplastic material (as long filament) from a plurality of fine tube spinning heads that are generally circle.Spun-bonded fibre is not clamminess usually by quenching and when they are deposited on the collection surface.It is continuous that spun-bonded fibre is generally.
Term used herein " meltblown fibers " is meant the fiber that is formed by following method: with molten thermoplastic clamp-on a plurality of be generally circular fine molded microcapillaries become the high speed gas that fusion filament or long filament enter into convergence (as, air) in the stream, this high-speed air flow attenuates to reduce fibre diameter the molten thermoplastic long filament.Thereafter, meltblown fibers is by high velocity air delivery and be deposited on the collection surface, the knitmesh that constitutes with the meltblown fibers that forms by random scatter.
" one-tenth net " method of example comprises wet-laying and dry-laying.Exemplary dry-laying method includes but not limited to air lay, carded method, and their combination of canonical form stratification.The combinations produce of above method goes out to be commonly referred to the nonwoven material of mixture or compound.
Fiber in the nonwoven web typically is engaged on one or more adjacent fiber of some overlapping joint.This is included in each layer and engages fiber, and engages fiber when existing one deck above between each layer.Fiber can be by mechanical interlocking, engage by chemical bonding or by their combination.
In a preferred embodiment of the invention, supatex fabric is made by polypropylene (PP) and/or polyethylene (PE) and/or polyester (PET).In another embodiment, supatex fabric is made by the bicomponent fiber that PP and PET or PE and PP form.
In order to be used as the core wrap in the absorbent article, described supatex fabric is preferably made by the combination (SMMS) of spun-bond process and meltblown, and its basic weight is preferably 7g/m 2To 30g/m 2, 8g/m more preferably 2To 20g/m 2, even 8g/m more preferably 2To 15g/m 2
In order to be used as the top sheet materials in the absorbent article, described supatex fabric preferably comprises spun-bonded fibre.The basic weight of top flat is preferably between 10g/m 2And 30g/m 2Between, 15g/m more preferably 2To 20g/m 2In another embodiment, top flat comprises the supatex fabric of carded, and its preferred basic weight is 10g/m 2To 25g/m 2, 15g/m more preferably 2To 20g/m 2
In order to be used as the capturing material in the absorbent article, nonwoven material is preferably by the carded manufactured, and its basic weight is preferably 20g/m 2To 200g/m 2, 40g/m more preferably 2To 100g/m 2, even 50g/m more preferably 2To 70g/m 2Described material further for example utilizes resin or air hot adhesion method bonding.
Make the method for permanent hydrophilic supatex fabric
Method of the present invention relates to the processing of fibroreticulate processing of synthetic nonwoven or many synthetic fiber.This method is very economical, because it comprises cheap chemical products.In addition, this method is very fast.It can at least 200 meters/minutes, and more preferably at least 300 meters/minutes, even more preferably at least 400 meters/minutes linear velocity operation.
The method of handling nonwoven web/plurality of fibers as described herein may further comprise the steps:
Step a)
Synthetic nonwoven web is provided or many synthetic fiber are provided.Described nonwoven web or fiber can be made by resin (as polyamide, polypropylene, polyethylene, polyester etc.).The representative diameter scope of the fiber that nonwoven web comprised is extremely greater than about 0.2mm less than about 0.001mm.
The basic weight that is suitable for nonwoven web of the present invention is preferably 5g/m 2To 200g/m 2, more preferably 7g/m 2To 150g/m 2, more preferably 7g/m also 2To 100g/m 2
The especially preferred fiber web of the present invention be have by polypropylene form spunbond-melt and spray-melt and spray-fiber web of spunbond layer (SMMS).Therefore, nonwoven material is a multi-layered web, has two-layer skin and the two-layer internal layer of being made by spun-bond process of being made by meltblown.This SMMS nonwoven web preferably has 8g/m 2To 15g/m 2Basic weight.
The spun-bonded fibre net that another especially preferred fiber web of the present invention is made up of polypropylene (PP), it has 15g/m 2To 20g/m 2Basic weight.
The carded web that especially preferred another fiber web of the present invention is made up of polyester (PET), it has 40g/m 2To 80g/m 2Basic weight.
If plurality of fibers is used for method of the present invention, then described plurality of fibers can form supatex fabric in the inventive method further method step of any time, for example with plurality of fibers with before the aqueous solution contacts, or plurality of fibers is exposed to after the ultraviolet radiation.In addition, the additional method step that individual fibers or long filament is formed supatex fabric can comprise at least the first plurality of fibers and second plurality of fibers, and wherein said first plurality of fibers is different from described second plurality of fibers.This difference for example can be, because the different hydrophilic monomer in the aqueous solution.In one embodiment of the invention, only described first plurality of fibers is through the inventive method (fiber of handling).In this embodiment, the supatex fabric that is formed by different plurality of fibers comprises that handled and untreated fiber.
Step b)
The aqueous solution that comprises hydrophilic monomer, corsslinking molecular and radical polymerization initiator is provided.
The described aqueous solution comprises can be by the monomer of Raolical polymerizable generation polymerization.The monomer molecule that the described aqueous solution comprises preferably comprises at least one unsaturated double-bond.Preferred described monomer comprises the group that can generate salt with acid or alkali reaction, as amido or carboxylic acid group.
Suitable monomers and comonomer can be acidity, neutrality, alkalescence or bisexual ion purification.Suitable strong acid monomer comprises those that are selected from alkene unsaturated aliphatic or aromatic sulfonic acid, as 3-sulfo group propyl group (methyl) acrylate, 2-sulfoethyl (methyl) acrylate, vinyl sulfonic acid, styrene sulfonic acid, allyl sulphonic acid, vinyl toluene sulfonic acid, isobutenyl sulfonic acid etc.Especially preferred strong acid monomer is 2-acylamino--2-methyl propane sulfonic acid, 3-sulfo group propyl group (methyl) acrylate, 2-sulfoethyl (methyl) acrylate.Suitable weak acid monomer comprises those that are selected from alkene unsaturated carboxylic acid and carboxylic acid anhydrides, as acrylic acid, methacrylic acid, maleic acid, itaconic acid, crotonic acid, ethylacrylic acid, citron conicic acid, fumaric acid, β-steroid base acrylic acid etc.Particularly preferred weak acid monomer is acrylic acid and methacrylic acid.
Be used for other proper monomer of the present invention, monomer, acidiferous monomer and non-acid monomers as cation are disclosed in U.S.6,380,456 (the 11st and 12 volumes).
Described monomer be included in concentration in the aqueous solution by described solution weight preferably between 10% and 70%, more preferably between 15% and 50%, also more preferably between 20% and 40%, most preferably between 25% and 35% monomer.Higher relatively monomer concentration helps to occur in the whole efficiency of the polymerization process in the ultraviolet radiation method step.Thereby, remain in the online unreacted monomer amount of non woven fibre after can reducing ultraviolet radiation.
The aqueous solution also comprises radical polymerization initiator.Described initator can be formed with the free radical (light trigger) of reactivity by photoactivation the time.Because suitable light trigger is usually because of absorbing ultraviolet light by optimal activation, so initator should preferably absorb the light in the ultraviolet spectra.Initator also should fully be dissolved in the aqueous solution that comprises monomer.
Be applicable to that light trigger of the present invention comprises alpha-alcohol ketone and phenyl dimethyl ketal type.In addition, suitable light trigger comprises that dimethoxy-benzophenone is (with trade name Irgacure 651 available from Ciba Specialty Chemicals Inc., Switzerland), 2-hydroxy-2-methyl propiophenone is (with trade name Darocur 1173C available from Ciba Specialty Chemicals Inc., Switzerland), I-hydroxy-cyclohexyl benzophenone is (with trade name Irgacure 184 available from CibaSpeciality Chemicals Inc., Switzerland), and diethoxy acetophenone, and 2-hydroxyl-4 '-(2-hydroxyl-oxethyl)-2-methyl-propiophenone is (with trade name Irgacure 2959 available from Ciba Speciality Chemicals Inc., Switzerland).Darocur 1173C, Irgacure2959 and Irgacure 184 are preferred light triggers.Irgacure 2959, Darocur 1173C and Irgacure 184 are especially preferred.Also can use the combination of light trigger.
Other embodiment of suitable radical polymerization initiator is benzophenone and derivative, acetophenone, benzoyl peroxide or azo-two-isobutyronitrile (AIBN) thereof.
Can use any concrete initator, or alternatively, the combination of two or more different initators.If use the combination of different initators, then preferred their maximal ultraviolet absorption is in the different range of ultraviolet spectra.In addition, the selection of initator must make it can absorb the ultraviolet light that is used for the ultraviolet radiation method step.Except light trigger, the described aqueous solution also can comprise one or more additional radical initiators, does not need light absorbing thermal initiator and redox radical initiator as forming free radical.Suitable alternative initator is disclosed in for example U.S.Re.32, in 649.
Just as already noted, the solubility of initator in the aqueous solution must be considered.For example, solubility will depend on selected monomer.If benzophenone is used as monomer as initator with acrylic acid, then must therefore select acrylic acid degree of neutralization.With respect to acrylic acid, benzophenone more is not soluble in sodium acrylate (acrylic acid of the neutralization) aqueous solution.Therefore, be that the solubility about by weight 0.5% of 0% o'clock benzophenone is compared with degree of neutralization, acrylic acid concentration be about 30% and degree of neutralization be about 70% o'clock, the solubility of benzophenone is restricted to concentration and mostly is 0.1% most approximately by the weight of the described aqueous solution.Select as another of benzophenone, can use the water-soluble bigger hydrogen initator (as, acetophenone) of taking by force.
As another embodiment, Darocur 1173C has good solubility in degree of neutralization is the acrylic acid aqueous solution of 0% neutralization, but is only to have limited solubility at 70% o'clock at degree of neutralization.In order to increase the solubility of initator in these solution, can use Irgacure 2959 to replace Darocur 1173C.Although dissolving slowly, in being neutralized to maximum 70% acrylic acid concentrated solution, can obtain by described aqueous solution weight at least about 2.0% concentration.
Usually, the concentration of initiator molecule is preferably 0.01% to 5% by described aqueous solution weight in the aqueous solution, more preferably is 0.1% to 3% by weight, even more preferably by weight 0.5% to 2.5%.Yet preferred concentration depends on the degree of neutralization (embodiment that may be neutralized for those monomers) of selected initator, applied monomer and monomer.Higher relatively initiator concentration helps to occur in the whole efficiency of the polymerization process in the ultraviolet radiation method step.Therefore, remaining in the online unreacted monomer amount of non woven fibre after the ultraviolet radiation of relatively low dosage can reduce.
Be suitable for corsslinking molecular of the present invention and be preferably polyfunctional (as, two senses, trifunctional, four senses).Crosslinking agent is preferably polyfunctional monomer, its have at least two can with the response location of selected monomer copolymerizable, and must fully be dissolved in the aqueous solution that comprises described monomer.
Suitable polyfunctional monomer crosslinking agent comprises poly(ethylene oxide) two (methyl) acrylate, IRR280 (the PEG diacrylate with different PEG molecular weight, available from UCB Chemical, Belgium), have trimethylolpropane ethoxylation three (methyl) acrylate, an IRR210 (oxyalkylated triacrylate of different rings oxidative ethane molecular weight; Available from UCB Chemicals, Belgium), trihydroxy propane three (methyl) acrylate, divinylbenzene, pentaerythritol triacrylate, pentaerythritol triallyl ether, triallylamine, N, N-methylene-bisacrylamide and other polyfunctional monomer crosslinking agent known in the art.Preferred monomer crosslinked dose comprises polyfunctional diacrylate and triacrylate.
Although it is less preferred, but also may use the polyfunctional crosslinking agent of all or part that only comprises a polymerisable monomer group, one or more other functional groups that wherein said crosslinking agent comprised form crosslinked with the monomer reaction that is blended in the polymer chain, or using even not having all or part of polyfunctional crosslinking agent of polymerisable monomer group, wherein said multifunctional crosslinking agent is sneaked into functional group reactions in the polymer chain with at least two by polymerisation.Also may use and not form the covalency chain and form crosslinked all or part crosslinking agent.These crosslinking agents can interact by means of the functional group on non-covalent bond reciprocation such as static, network and effect, hydrogen bond and dispersion force reciprocation and the polymer chain.The suitable crosslinking agents of these types is described in U.S.32, in 649.
The preferred concentration of corsslinking molecular is for by the weight 0.01% to 10% of the described aqueous solution in the aqueous solution, and more preferably by weight 0.1% to 5%.The corsslinking molecular of higher concentration can cause the concentration of soluble polymeric thing to reduce relatively.It also will cause crosslinked after harder hydrophilic polymer network, this is preferred in the present invention, because it has reduced the ability that expands when described hydrophilic polymer network absorbs liquid, thereby the reserve capacity of having guaranteed nonwoven web of the present invention is lower, and the hole of nonwoven web is not blocked in a large number when absorbing liquid.
Can be randomly, aqueous solution also comprises surfactant and/or organic solvent are to improve nonwoven web by the wettability of the aqueous solution.The embodiment of the organic solvent that is suitable for is the various alcohol with different length and different degree of branching alkyl chains.
Usually, surfactant can be anion, CATION and non-ionic.The embodiment of nonionic, anion, CATION, both sexes, amphion and semi-polar nonionic surfactants is disclosed in U.S.5, and 707,950 and U.S.5,576,282.As described herein, use non-ionic surface active agent such as long-chain (C 12To C 22) ethoxylated alcohol is preferred.If use acrylic acid as monomer, then cationic surfactant is less preferred, because these surfactants can react with acrylic monomers, it is precipitated out from the aqueous solution.Be applicable to that surfactant of the present invention is Neodol 91-6 (available from Shell International B.V., The Netherlands).Neodol 91-6 has 9-11 methylene on chain, and has 6 CH at head 2CH 2-O group.
The surfactant that preferred the present invention uses is used as comonomer, thereby in the hydrophilic polymer that combined polymerization to nonwoven web comprises when ultraviolet radiation.Thereby guarantee that surfactant can for example not be rinsed when nonwoven web contacted with liquid between the operating period when nonwoven web is used for absorbent article.
Can use any polymerisable surfactant with the non-surface-active agent monomer copolymerizable.The preferred surfactants monomer has the reactive ratio with one or more available non-surface-active agent monomers, and this sneaks in the polymer chain with having promoted higher degree.Therefore, for preferred (methyl) acrylic monomers, preferably surfactant monomer comprises copolymerizable (methyl) acrylic acid, ester or amide functional group.Especially preferred polymerisable surfactant is the acrylic acid and the methacrylate of alkyl polyoxyethylene surfactant.Suitable methacrylic acid ester surfactant can trade name LEM 23 and BEM 23 available from BIMAX Chemicals, USA.
If acrylic acid is as monomer, then preferred comonomer surfactant comprises acrylic acid groups.It is believed that these acrylic acid groups have strengthened and acrylic acid copolymerisation.
The preferred concentration of surfactant counts 0.01% to 30% by described aqueous solution weight, and more preferably 0.25% to 10%, also more preferably be 0.25% to 5% by weight, most preferably be 0.5% to 2% by weight.
Step c)
Described nonwoven web or plurality of fibers are contacted with the aqueous solution that comprises hydrophilic monomer, corsslinking molecular and radical polymerization initiator.Radical polymerization process can take place in described monomer.
The step that described nonwoven web/plurality of fibers contacts with the described aqueous solution is preferably carried out in inert gas atmosphere such as nitrogen, enter reaction medium to reduce oxygen.Preferably, the concentration of residual oxygen in the inert gas atmosphere is more preferably less than 60ppm less than 100ppm.
The aqueous solution that crucial for the present invention is permeates described nonwoven web/plurality of fibers and contacts fiber closely with the component of guaranteeing the aqueous solution and being comprised.This point can realize like this, for example, by using pressurization to apply the aqueous solution (as the slot type coating), or apply vacuum (preferably below fiber web/plurality of fibers) by a side at fiber web/plurality of fibers, and apply the aqueous solution (preferably above fiber web/plurality of fibers), thereby the aqueous solution is immersed in fiber web/plurality of fibers at the opposite side of fiber web/plurality of fibers.
Yet also crucial for the present invention is, the additional content of the additional content of component that the aqueous solution comprises, especially monomer is relatively low.
As described in the method for the present invention, must select the concentration of monomer that the aqueous solution comprises, make the additional content of hydrophilic crosslinked polymer on nonwoven web/plurality of fibers that in ultraviolet radiation method step subsequently, forms less than 30% (by the weight of the nonwoven web/plurality of fibers of no hydrophilic crosslinked polymer).Preferably, should select the concentration of monomer in the aqueous solution, make the additional content of hydrophilic crosslinked polymer on nonwoven web/plurality of fibers by weight less than 25%, also more preferably by weight less than 20%, even more preferably by weight less than 15%, most preferably by weight less than 10%.Yet the additional content of described hydrophilic crosslinked polymer should be at least 1% by weight, more preferably by weight at least 2%.
The additional content of hydrophilic crosslinked polymer will depend on the additional content of (but before ultraviolet radiation step) monomer behind the nonwoven web/plurality of fibers contact aqueous solution, the additional content of monomer will be at least with the additional content of cross-linked hydrophilic polymer as many.Yet the additional content of monomer may be higher than the additional content of hydrophilic crosslinked polymer after directly fiber web/plurality of fibers being contacted with the aqueous solution, because a part of monomer may lose before ultraviolet radiation, for example, by evaporation.Yet during ultraviolet radiation, the monomer that exists on fiber web/plurality of fibers will almost all be attached in the hydrophilic crosslinked polymer, because polymerization process is very effective, has only a small amount of unreacted monomer.Therefore, the difference between the additional content of added monomer content and hydrophilic crosslinked polymer is very little, mainly is to be caused by the loss of monomer that causes because of evaporation.
In addition, expectation can be coated in the aqueous solution on nonwoven web/plurality of fibers equably.
The appropriate method that nonwoven web/plurality of fibers contacts with the aqueous solution has for example kiss-roll coating or spraying.These two kinds of methods are well-known in the art.
Yet, the aqueous solution being coated in method for optimizing on nonwoven web/plurality of fibers as described in the present invention being to use slot type coating in the contact coating, it also is known in the art.The slot type coating guarantees that the aqueous solution permeates nonwoven web/plurality of fibers fully.
The aqueous solution also can be sprayed on nonwoven web/plurality of fibers.As kiss-roll coating, spraying can reduce and control easily the additional content of the aqueous solution, and it is preferred in the present invention.
As described herein, preferably nonwoven web/plurality of fibers is contacted with the aqueous solution, because be difficult to the additional content of component on nonwoven web/plurality of fibers of the control aqueous solution like this by directly nonwoven web/plurality of fibers being put into the bath that comprises the aqueous solution.
Be used for the UV Absorption that the not appreciable impact of preferred solvent of the aqueous solution as described herein is used for the light trigger of initiated polymerization.For the concrete light trigger in the solvent, if for export and be used to cause the frequency of Raolical polymerizable by ultraviolet source by light trigger, with respect to the light that light trigger absorbs, solvent does not absorb a large amount of ultraviolet lights, and this point just can realize so.Preferred solvent can see through ultraviolet radiation fully.Simultaneously, when directly being exposed to ultraviolet radiation or have the free radical of " excitation state " light trigger or any generation, preferred solvent do not take place chemical reaction (as, take hydrogen by force).In addition, the preferred character of not negative effect nonwoven web/plurality of fibers of solvent.An embodiment of suitable solvent is a water.
For the wettability that makes nonwoven web/plurality of fibers easier, thereby held water solution is penetrated into as in the described nonwoven web/plurality of fibers of the inventive method, may make nonwoven web/plurality of fibers with before the aqueous solution contacts through corona treatment.
Corona discharge is a kind of electrical phenomena, when it betides air and is exposed in the voltage potential that is high enough to cause ionization, thereby it is changed into electric conductor from electrical insulator.By making nonwoven web/plurality of fibers through corona treatment, the surface energy of nonwoven web/plurality of fibers increases, and this helps wettability.
The suitable equipment of nonwoven web/plurality of fibers corona treatment is Laboratory CoronaTreater (model #BD-20AC, by E1ectro-Technic Products Inc., USA makes).Commercial-scale equipment is provided by Corotec company.Corona treatment and suitable device are well known in the art, referring to for example U.S.5,332,897.Between 0.2W/ (0.3m * 0.3m * minute) ((foot * foot * minute)) and 0.5W/ (0.3m * 0.3m * minute) ((foot * foot * minute)) between the corona energy dose be suitable for the surface energy of polypropylene nonwoven fiber web/plurality of fibers is increased between 40mN/m and the 45mN/m from about 30mN/m.
As the embodiment of the aqueous solution, the surface tension of water is about 72mN/m.Thereby the fiber web/plurality of fibers after the corona treatment is easily by water-wet.
In addition, corona treatment also helps forming free radical in nonwoven web/plurality of fibers.Be not bound by theory, it is believed that the number of the hydrophilic polymer of chemical graft on nonwoven web/plurality of fibers can increase.This sticks on fiber web/plurality of fibers with utilizing the hydrophilic polymer durability, and the danger that helps reducing to use in fiber web/plurality of fibers process as be rinsed during contact liq when being used for absorbent article.
Alternatively or except that corona treatment, the aqueous solution also can comprise surfactant to reduce the surface tension of solution.
Alternatively or except that the aqueous solution comprises surfactant, the nonwoven web/plurality of fibers that provides for the inventive method also can its with handle with surfactant before the aqueous solution contacts.
Step d)
Nonwoven web makes nonwoven web/plurality of fibers be exposed to ultraviolet radiation with after the aqueous solution contacts.
In a preferred embodiment of the invention, the standard medium pressure mercury lamp is launched the ultraviolet light that between 100nm and 400nm (this depends on the light trigger of having selected) has maximum transmission rate.Suitable lamp for example can be available from IST MetzgmbH, Neurtingen, Germany (for example, the lamp model is M350K2H).It is long that preferred lamp is characterised in that energy is output as 160W/cm to 200W/cm lamp.
The energy size of reacting required for example depends on that specifically the chemical property of monomer, required additional content, thickness, linear velocity and nonwoven web/plurality of fibers and the distance between the energy source, the concentration of light trigger and the expectation of residual monomer of nonwoven web/plurality of fibers reduce degree.
In a preferred embodiment, nonwoven web/plurality of fibers be placed in from UV ray radiation source may be recently and not can fusion, the position of burning or damaged fiber.
As described herein, preferably nonwoven web is shone at fibroreticulate two first type surfaces with ultraviolet light.Therefore, uviol lamp is preferably placed in the face of fibroreticulate two surfaces.Thereby, can increase the efficient of ultraviolet radiation.
Total ultraviolet dosage that nonwoven web/plurality of fibers preferably exposes is 300mJ/cm at least 2, more preferably 450mJ/cm at least 2, even more preferably 600mJ/cm at least 2, more preferably 650mJ/cm at least also 2, 700mJ/cm at least most preferably 2
The step that described nonwoven web/plurality of fibers is exposed to ultraviolet radiation is preferably carried out in inert gas atmosphere such as nitrogen, enters reaction medium to reduce oxygen.Preferably, the concentration of residual oxygen in the inert gas atmosphere is more preferably less than 60ppm less than 100ppm.
The UV Absorption of light trigger cause forming the free radical that can cause the Raolical polymerizable that has monomer in the solution (as, by the fracture of key).Contact liq in nonwoven web of the present invention/plurality of fibers use (as, be used in the embodiment of absorbent article the contact urine at nonwoven web/plurality of fibers) time, the cross-linked hydrophilic polymer of gained can significantly not be rinsed.Be not bound by theory, it is believed that nonwoven web/plurality of fibers is because following combination to the confining force of cross-linked hydrophilic polymer: (i) crosslinked cause insoluble and the (ii) entanglement of cross-linked hydrophilic polymer and fiber web/plurality of fibers.It is believed that when monomer and initator contact the fiber that nonwoven web/plurality of fibers comprises closely cross-linked polymer will form around fiber, " encirclement " fiber, so they are " locked " on fiber.Although not necessarily, preferred at least a portion polymer simultaneously chemical graft at least a portion fiber that nonwoven web/plurality of fibers comprised.
Because component (as, initiator molecule, corsslinking molecular) additional content, especially the additional content of monomer is relatively low, so the additional content of cross-linked hydrophilic polymer is also relatively low, preferably by (nonwoven web/plurality of fibers of no hydrophilic crosslinked polymer) weight less than 30%, more preferably by weight less than 25%, also more preferably by weight less than 20%, even more preferably by weight less than 15%, most preferably by weight less than 10%.Yet the additional content of described cross-linked hydrophilic polymer should be at least 1% by weight, more preferably by weight at least 2%.Thereby, do not have the super-absorbent polymer of high reserve capacity on nonwoven web/plurality of fibers, to form.Therefore, comprise reserve capacity as the nonwoven web of the fiber of processing as described in the inventive method also with relatively low.Can may not block the hole of nonwoven web because of a large amount of the expansion when this guarantees the polymer suction, that will reduce the permeability for liquids of nonwoven web.When especially being used as the top flat in the absorbent article, core wrap or acquisition layer for nonwoven web, the permeability for liquids of nonwoven web is essential.
As a result, described method has obtained the nonwoven web/plurality of fibers of highly-hydrophilic.In addition, described nonwoven web/plurality of fibers is a permanent hydrophilic because hydrophilic polymer at intrafiber crosslink connection and/or entanglement and/or chemical graft to fibroreticulate fiber, can not be rinsed when making their contact liqs.
Randomly, method of the present invention can comprise drying steps after ultraviolet radiation, might remain in the aqueous solution (especially solvent) on nonwoven web/plurality of fibers to remove.
The absorbability of nonwoven web and reserve capacity depend on (absorption/reservation) capacity of nonwoven web (no hydrophilic polymer) on the one hand as described in the present invention, depend on (absorption/reservation) capacity of the hydrophilic polymer of handling that fiber web comprised on the other hand.
The nonwoven web typical case has the reserve capacity that is significantly less than its absorptive capacity.This means that when nonwoven web can absorb a large amount of relatively liquid-depend on for example fibroreticulate thickness and basic weight, their typical cases can not keep the liquid that is absorbed, for example under pressure.
Polymer such as super-absorbent polymer have high absorptive capacity and high reserve capacity usually simultaneously, even also be " locked " in polymer at liquid under pressure.Therefore, super-absorbent polymer is typically applied in the memory unit of absorbent article.
Yet for the purpose of the present invention, the main task of the hydrophilic polymer that nonwoven web comprised is not a storaging liquid, but makes nonwoven web hydrophilic.The nonwoven web that comprises hydrophilic polymer is easier to be more wetted than untreated normally hydrophobic synthetic nonwoven fiber web.Therefore, liquid more effectively be gathered and be transmitted to nonwoven web of the present invention can than untreated fibers net.These characteristics have reduced the danger of leaking for being especially desirable with described fiber web as top flat, acquisition layer or core wrap in the absorbent article because absorb rapidly.
Because hydrophilic polymer is at the online less relatively additional content and the relative higher degree of cross linking of non woven fibre, so the absorptive capacity of these hydrophilic polymers and reserve capacity are also relatively low.In addition, the same with those (no hydrophilic polymers) as mentioned above, the reservation restriction of nonwoven web is also relatively low.Therefore, fibroreticulate as described in the present invention whole reserve capacity is relatively low.This is opposite with the online super-absorbent polymer that forms of non woven fibre known in the art, and it is high reserve capacity owing to super-absorbent polymer has.
When measuring according to the centrifugal reserve capacity of cylinder (CCRC) method of testing of hereinafter describing in detail, at least one 1cm that comprises the nonwoven web of the present invention of hydrophilic polymer takes advantage of the reserve capacity in 1cm zone less than 100g/m 2(every square metre of gram number that comprises the nonwoven web of hydrophilic polymer) is preferably less than 80g/m 2, be more preferably less than 50g/m 2, even be more preferably less than 35g/m 2At least one 5cm of preferred nonwoven web of the present invention takes advantage of the reserve capacity in 10cm zone less than 100g/m 2, be more preferably less than 80g/m 2, even be more preferably less than 50g/m 2, most preferably less than 35g/m 2In addition, in the most preferred embodiment, the Zone Full of nonwoven web all has above-mentioned reserve capacity.
In contrast, to comprise the reserve capacity that the nonwoven web typical case of super-absorbent polymer has be about 800g/m to prior art 2To several thousand g/m 2
Comparatively speaking, basic weight is 5g/m 2To 200g/m 2And the common reserve capacity of the nonwoven web that is untreated that does not comprise any hydrophilic polymer of the present invention is about 1g/m 2To about 10g/m 2Basic weight is 7g/m 2To 150g/m 2And the common reserve capacity of the nonwoven web that does not comprise any hydrophilic polymer is about 1g/m 2To about 7g/m 2Basic weight is 7g/m 2To 150g/m 2And the common reserve capacity of the nonwoven web that does not comprise any hydrophilic polymer is about 1g/m 2To about 5g/m 2
The reserve capacity of nonwoven web of the present invention not only depends on the additional content of hydrophilic polymer, and depends on the degree of cross linking of these hydrophilic polymers: the polymer of high-crosslinking-degree shows to have lower absorptive capacity and reserve capacity usually.Because that part of polymer molecular weight between adjacent network is crosslinked is relatively low, so they can not expand very much.Therefore, highly cross-linked polymer can't equally with the polymer of low crosslinking degree expand.
If nonwoven web of the present invention is used for absorbent article, even then expectation is after liquid (as urine) is subsequently gushed out, described nonwoven web also shows to have the low saturating wet time.Liquid is wet thoroughly to be meant that liquid sees through supatex fabric, and the wet thoroughly time of liquid is meant that the liquid of a basic weight sees through the time that nonwoven web spent.The wet thoroughly time of liquid is according to hereinafter described test determines as described in the present invention.
Preferred nonwoven web of the present invention shows that the 5th time of the having wet thoroughly time of liquid that liquid is gushed out less than 5 seconds, comprises the 5mL saline solution and gush out at every turn.More preferably the liquid of gushing out for the 5th time wets the time thoroughly less than 4.5 seconds, even more preferably gushes out less than 4.0 seconds for the 5th time.Therefore, even after gushing out several times, can also keep liquid wet thoroughly.The wet thoroughly time of the liquid of described nonwoven web was compared with the saturating wet time of gushing out for the first time after also more preferably gushing out for the 5th time, and increase is no more than 5%.
Even since the nonwoven web of the present invention that comprises hydrophilic polymer deposit (as, in the warehouse) after several weeks, still keep hydrophilic.Even it is therefore preferable that at test liquid nonwoven web of the present invention stored at least 10 weeks before the wet thoroughly time, this nonwoven web shows that the 5th time of the having wet thoroughly time of liquid that liquid is gushed out was less than 5 seconds.
When described supatex fabric was exposed in the aqueous solvent, not having obviously, the hydrophilic polymer of part was rinsed.Therefore, when supatex fabric was exposed in the aqueous solution, surface tension can significantly not reduce.
Usually,, preferably be 65mN/m at least, more preferably 68mN/m at least, even more preferably 71mN/m at least from the surface tension of handling the back aqueous fluid that rinses out of supatex fabric if nonwoven web of the present invention is applied in the absorbent article.
In addition, preferably have such nonwoven web, wherein the distribution of the hydrophilic polymer that nonwoven web of the present invention comprised is uniform substantially." uniform substantially " is as giving a definition as described in the present invention: the hydrophilic polymer that nonwoven web comprised has covered in the nonwoven web at least 60% selected at random 100mm 2(10mm takes advantage of 10mm) zone.The selection area scanning electron microscope analysis.More preferably, described hydrophilic polymer covers at least 70%, even more preferably at least 80% selected at random 100mm 2The zone.The selection area scanning electron microscope analysis.
The preferred hydrophilic polymer of the present invention be part neutralization poly-(methyl) acrylic acid, its copolymer with and starch derivatives.Most preferably, described hydrophilic polymer comprises polyacrylic acid (that is, poly-(sodium acrylate/acrylic acid)).Preferably, described hydrophilic polymer is neutralized at least 50%, and more preferably at least 70%, even more preferably between 70% and 99%.
Usually, degree of neutralization is to nonwoven web and method all have certain influence as described in the present invention.The not easier polymerization of monomer of neutralization, acid form, and synthetic crosslinking polymer network expands less in water and physiological solution.In addition, only comprise not in and polymer of monomers more not hydrophilic, therefore be more worthless for the purpose of the present invention.
In comprising and the solution of monomer (salt) be not easy the evaporation and more hydrophilic.Because they have higher hydrophily, it is also more difficult therefore to be coated to common hydrophobic-nonwoven web/plurality of fibers.
Method of the present invention can be carried out very effective polymerization process, has only a spot of unreacted monomer to remain on fiber web/plurality of fibers after the polymerization.With respect to the dry weight of fiber web/plurality of fibers, the amount of unreacted monomer is more preferably less than 1000ppm preferably less than 2000ppm after the polymerization.For example, this is because for the purpose of the present invention, the even polymerization of monomer is not disadvantageous, if the fiber that the component that the described aqueous solution comprises such as monomer, initiator molecule and corsslinking molecular contact nonwoven web/plurality of fibers closely, thus can form cross-linked polymer at fiber " on every side ".This is grafted on method on the fiber with concentrating on polymer chemistry, and the method for especially not using corsslinking molecular is opposite.In these methods, must avoid the even polymerization of monomer, and must guarantee glycerol polymerization (for example, by selecting suitable initator) on fiber.Therefore, polymerization process efficient is quite low, causes that remnants, the unreacted monomer of relatively large amount remains on nonwoven web/plurality of fibers after the ultraviolet radiation.Therefore, these methods need washing step to rinse out unreacted monomer usually after ultraviolet radiation.
As described herein, the unreacted monomer amount on fiber web/plurality of fibers of remaining in after the polymerisation is more preferably less than 1000ppm preferably less than 2000ppm.The amount of residual monomer is measured according to Edana measuring method 410.2-02 " Determination of the amount of residualmonomers " in 2002, described thus method of testing is adjusted, be not to use the super absorption of 1.000g PA powder, and be to use the 1.000g nonwoven web to be used as part of detecting.
Therefore, another advantage of the inventive method is that to remain in the amount of unreacted on nonwoven web/plurality of fibers, residual monomer after the ultraviolet radiation relatively low.Therefore, the inventive method does not need washing step after ultraviolet radiation, and this is that high speed nonwoven material manufacture method is desired.If nonwoven web/plurality of fibers of the present invention is applied in the absorbent article, unreacted monomer is especially debatable, because a large amount of unreacted monomers is considered to worthless, especially when they and wearer's contact skin.
Absorbent article
Fig. 1 is the plane of diaper 20, and this diaper is as a preferred embodiment according to absorbent article of the present invention.Described diaper illustrates with its open and flat not contraction state (that is the nonelastic contraction that causes).The some parts of structure is broken away more to clearly illustrate the fabric of diaper 20.Diaper 20 contact wearers' part is towards the observer.The substrate 22 of diaper 20 comprises the main body of diaper 20 among Fig. 1.Substrate 22 comprises an outer covering piece, and this outer covering piece comprises the egative film 26 of a liquid permeable topsheet 24 and/or a liquid non-permeate.Substrate 22 can also comprise the most of of the absorbent core 28 that is encapsulated between top flat 24 and the egative film 26 or all.Substrate 22 preferably also comprises the leg hoop 32 and the waist feature 34 of lateral plate 30, band elastic component 33.Leg hoop 32 and waist feature 34 typically comprise elastic component.An end of diaper is set to the front waist region 36 of diaper 20.Corresponding end is set to the back waist region 38 of diaper 20.The mid portion of diaper is set to crotch district 37, and the crotch district is longitudinal extension between the lumbar region, front and back.Crotch district 37 is when diaper 20 is worn, and is usually located at the diaper part between wearer's thigh.
Lumbar region 36 and 38 can comprise fastening system, and this fastening system comprises fastening member 40 that preferably is connected to back waist region 38 and the touch-down zone 42 that is connected to front waist region 36.
Diaper 20 has longitudinal axis 100 and axis of pitch 110.The periphery of diaper 20 is limited by the outward flange of diaper 20, and wherein longitudinal edge 44 is parallel to longitudinal axis 100 extensions of diaper 20 usually, and end limit 46 is parallel to axis of pitch 110 extensions of diaper 20 usually.
This diaper also can comprise miscellaneous part known in the art, and auricle and back auricle, waist emulsion sheet, elastomeric element etc. before these parts comprise are to provide stickiness, the property held and aesthetic preferably.
Absorbent core 28 can comprise any absorbing material, and is normally compressible, the suitable shape of this material, non-stimulated to wearer's skin, and can absorb and liquid hold-up, for example urine and other some body excretions.Absorbent core 28 can comprise multiple liquid absorption material, and these materials are generally used for disposable diaper and other absorbent article, for example is commonly referred to as the pulverizing wood pulp of airfelt.The embodiment of the absorbing material that other is suitable comprises the crape cellulose wadding; Meltblown polymer comprises the meltblown polymer of coforming; Chemicosolidifying, modification or cross-linked cellulosic; Thin paper comprises tissue packaging material and thin paper laminated material, and absorbing foams absorbs sponge, absorbent gelling material, or the combination of any other known absorbing material or material.Absorbent core also can comprise the non-liquid absorbent materials of a small amount of (typical case is less than 10%), for example adhesive, wax, oil and similar material.
In addition, SAP particle of the present invention can be used as absorbing material.The consumption of SAP particle of the present invention is preferably at least 50% by described whole absorbent core weight, and more preferably at least 60%, even more preferably at least 75%, and even more preferably at least 90%.
Fig. 2 is presented at the sectional view of Fig. 1 that axis of pitch 110 got.Fig. 2 illustrates the preferred embodiment of the included zones of different of absorbent core.In Fig. 2, fluid acquisition zone 50 comprises upper acquisition layer 52 and lower acquisition layer 54, and the fluid storage district below the fluid acquisition zone comprises accumulation layer 60, and this accumulation layer is by top core wrap layer 56 and lower core wrap layer 58 parcels.
In a preferred embodiment, upper acquisition layer 52 comprises supatex fabric as described in the present invention, and lower acquisition layer 54 preferably includes the mixture of chemicosolidifying, twisting and crimped fibre, high surface area fiber and thermoplasticity viscose fibre.In a further preferred embodiment, two acquisition layers 52,54 are all provided by nonwoven web as described in the present invention.Acquisition layer preferably directly contacts with accumulation layer.
Accumulation layer 60 preferably coats with the core lapping.In a preferred embodiment, core wrap comprises nonwoven web of the present invention.Core wrap can comprise top layer 56 (being also referred to as " core cap ") and bottom 58.Top layer 56 can be provided by two or more material piece of separating with bottom 58, and perhaps they alternatively can be provided by the material piece of one.If top layer and bottom 56,58 are provided by separating sheet, then top layer 56 preferably includes nonwoven web of the present invention at least, and bottom 58 can comprise other nonwoven web.In the embodiment of using the one material piece, this one sheet can be wrapped in around the accumulation layer 60, as at the C-folding region.In addition, the one sheet can be sealed after it is wrapped in around the accumulation layer.
Accumulation layer typical case of the present invention comprises the SAP particle that is mixed with fibrous material.Also can comprise the other materials that is suitable for absorbent core.
As described herein, the top flat 24 of preferred absorbent products and/or all or part core wrap are made by hydrophilic nonwoven fabric of the present invention.And the hydrophilic nonwoven fabric preferably is used as the capturing material 52 and/or 54 in the absorbent core 28 as described in the present invention.
Method of testing
1. the centrifugal reserve capacity of cylinder (CCRC)
This test is used for measuring when fiber web is subjected to centrifugal force, the fibroreticulate saline solution reserve capacity of non-woven synthetic nonwoven used herein (and when also when described material is used various power, the nonwoven web absorptive capacity was kept the index of ability during it was to use).
This is tested available any nonwoven web and carries out, for example, with the nonwoven web that does not comprise any hydrophilic polymer or any coating, with the nonwoven web that comprises hydrophilic polymer as described herein, and with the nonwoven web that comprises super-absorbent polymer particles known in the art.
At first, be prepared as follows saline solution: weighing 18.00g sodium chloride, and join in two liters of volumetric flasks, supply constant volume with 2 liters of deionized waters, and stir until all sodium chloride dissolvings.
Dark and enough hold the part saline solution of packing in the pan of four centrifuge cylinders greatly with activation to minimum 5cm, make liquid level mostly be 40mm (± 3MM) height most.
Each nonwoven web sample is tested in independent cylinder, and each is accurate to 0.01g with the cylinder weighing before being positioned over all samples wherein that is used.Very thin screen cloth is arranged at the cylinder bottom, makes fluid can leave cylinder.
The each measurement all carried out two parallel testings simultaneously; Therefore followingly always prepare two samples:
The nonwoven web that weighing 0.3g is to be tested is accurate to 0.005g (this is ' sample '), then sample is transferred in the overweight cylinder of empty title.(parallel sample is repeated this process.)
After sample is transferred to cylinder, put into pan that saline solution is housed (cylinder should be unmutually against or place) against the wall of pan with the cylinder of the sample that is about to pack into.
After 15 minutes (± 30 seconds), from pan, take out cylinder, saline solution is discharged from cylinder; Then, cylinder was put into pan 45 minutes again.Behind 60 minutes Immersion times, take out cylinder from solution altogether, excessive water is flowed out from cylinder, the cylinder that sample will be housed is then put into the round seat support of centrifuge, makes two parallel sample be in relative position.
Used centrifuge can be any centrifuge that is equipped with Centrifuge Cup, described Centrifuge Cup and cylinder and cylinder base match, can capture the liquid of discharging in the cylinder, and can send 250G (± 5G) centrifugal acceleration, described centrifugal acceleration puts on the material that is positioned on the cylinder base, for the internal diameter of 264MM, speed is 136RAD/S (1300RPM).Suitable centrifuge be HERAEUS MEGAFUGE1.0VWR#5211560 (VWR SCIENTIFIC, PHILADELPHIA, USA).Centrifuge is set to obtain the centrifugal acceleration of 250G.For root diameter is the HERAEUS MEGAFUGE1.0 of 264MM, centrifuge be set to 136RAD/S (1300RPM).
Centrifugal 3 minutes of sample (± 10 seconds).
Cylinder is taken out from centrifuge and weighing, be accurate to 0.01G.
To each sample (I), the centrifugal reserve capacity of cylinder (CCRC) W iBe expressed as the saline solution gram number that every gram nonwoven web is absorbed, be calculated as follows:
w i = m CS - ( m Cb + m S ) m S [ g g ]
Wherein:
m CS: be the cylinder quality [g] that contains sample after centrifugal
m Cb: the dried cylinder quality [g] that is n.s
m S: the sample quality [g] that is no saline solution
Then, calculate two W of this sample and parallel sample thereof iThe mean value of value (being accurate to 0.01g/g).
Therefore, be 15g/m for basic weight 2Nonwoven web, CCRC will be the CCRC value W that is measured by following formula i15 times.For example, be 15g/m for basic weight 2And CCRC is the nonwoven web of 5g/g, and every square metre of fibroreticulate CCRC will be 15g/m 2* 5g/g=75g/m 2
2. additional Determination on content
A) hydrophilic polymer is at the online additional content of non woven fibre:
Additional Determination on content is by weighing 1m 2The nonwoven web sample that does not comprise the cross-linked hydrophilic polymer.The weighing sample is accurate to ± 0.01g.
Sample is handled with after comprising as described in the present invention hydrophilic polymer, and once more it being weighed is accurate to ± 0.01g.Following then calculating adds content:
[(w a* 100)/w bThe percentage of the additional content of]-100=, wherein
w a: the fibroreticulate weight that comprises hydrophilic polymer
w b: the fibroreticulate weight that does not contain hydrophilic polymer
If after handling fiber web, measure additional content, then before measuring additional content, must make this fiber web, to guarantee the not having remaining aqueous solution to stay on the nonwoven web specimen through drying steps according to method of the present invention.
B) the additional content of hydrophilic polymer on plurality of fibers:
The measurement of added monomer content is similar to the mensuration of above-mentioned nonwoven web, but is not weighing 1m 2The nonwoven web sample, the initial testing sample is the 10g plurality of fibers, wherein said 10g plurality of fibers does not comprise the cross-linked hydrophilic polymer.The weighing sample is accurate to ± 0.01g.
When sample being handled with after comprising as described in the present invention hydrophilic polymer, once more it being weighed is accurate to ± 0.01g.Following then calculating adds content:
[(w a* 100)/w bThe percentage of the additional content of]-100=, wherein
w a: the weight that comprises the plurality of fibers of hydrophilic polymer
w b: do not contain the plurality of fibers of hydrophilic polymer weight (=10g)
If after handling plurality of fibers, measure additional content, then before measuring additional content, must make this plurality of fibers, to guarantee the not having remaining aqueous solution to stay on the plurality of fibers specimen through drying steps according to method of the present invention.
3. capillary mensuration
Surface tension (unit: mN/m) measure according to following test.
Device:
Equipment: K10 tensometer or same category of device that German Kr ü issgmbH provides.Ves-sel elevation speed should be 4mm/min.When using dull and stereotyped or encircling, liquid level should detect automatically.Described equipment must be able to be adjusted to correct height with sample position automatically.The test precision should be+/-0.1mN/m.
Step:
1. the salt solution (the NaCl deionized water solution of 0.9% weight) of 40mL is poured in the clean beaker.
2. with platinum loop or platinum board test surface tension.Under 20 ℃, surface tension should be 71 to 72mN/m.
With deionized water and isopropyl alcohol clean beaker and with gas range with its calcination several seconds.Wait for to reaching and equilibrium at room temperature.
4. the test nonwoven of 10 60 * 60mm is put into clean beaker.The basic weight of nonwoven material should be 10g/m at least 2
5. add 40ml salt solution (the NaCl deionized water solution of 0.9% weight).
6. the clean sticking plaster with surfactant-free stirred for 10 seconds.
7. allow the solution left standstill 5 minutes that is placed with nonwoven material.
8. stirred again for 10 seconds.
9. the clean sticking plaster with surfactant-free takes out nonwoven material from solvent.
10. made solution left standstill 10 minutes.
11. with platinum plate or platinum loop test surfaces tension force.
4. saturating wet mensuration
This test was carried out according to the wet thoroughly time of Edana method 150.3-96 (in February, 1996) liquid.The adjustment part of comparing with the Edana method is that following test is not only measured and gushed out for the first time but also measure gushing out several times subsequently.
Device
The wet thoroughly equipment of Lister:
-funnel of electromagnetic valve is housed: mass rate of emission is for discharging 25ml in 3.5 (± 0.25) in second.
-saturating wet plate: make the thick acrylic glass of 25mm.The gross weight of plate is necessary for 500g.Electrode should be erosion resistant.Electrode is embedded in cross section that the bottom of plate cuts for (in the groove of 4.0mm * 7.0mm) and fix with fast dried epoxy resin.
-substrate: the acrylic glass that about 125mm * 125mm is square.
Support the ring stand of funnel
Measure 0.01 second electronic timer
The buret of 50mL capacity
Ahlstr  mgrade 989 or suitable core filter paper (average saturating wet time 1.7s+/-0.3 second, size: 10 * 10cm)
Step
1. carefully cut the sample of the 12.5cm * 12.5cm of requirement, only at the EDGE CONTACT sample of sample.
2. get 10 label filter paper.
3. a sample is placed on the 10 metafiltration paper groups on the substrate.Sample should be to be used for being placed on filter paper towards the nonwoven material side (when being used for absorbent article) of user's skin in a kind of like this mode in the top.
4. saturating wet plate is placed on napex, wherein the plate center is above the sample center.
5. buret and funnel are concentrated on the top of plate.
6. guarantee that electrode is connected on the timer.Connect timer and clock is changed to zero.
7. fill buret with saline solution (the NaCl deionized water solution of 0.9% weight).
8. keep the dump valve of funnel to close and the liquid of 5.0mL (=once gush out) is splashed into the funnel from buret.
8. the electromagnetic valve of opening funnel is discharged the liquid of 5.0mL.Original liquid stream will be connected circuit and start timer.It will stop when liquid has infiltrated bedding and padding and drop under the electrode level on the wet plate.
9. shown time on the recorded electronic timer.
10. waited for 60 seconds and turned back to that the 6th step carried out gushing out for the second time, for the third time and any gushing out subsequently, gush out comprises 5ml liquid at every turn.
11. record: first, second and any time of gushing out subsequently, unit are second.

Claims (30)

1. synthetic nonwoven web, described fiber web comprise at least one be of a size of 1cm take advantage of 1cm, reserve capacity be every square metre of described nonwoven web less than the liquid, aqueous zone of 100g, wherein said zone comprises the cross-linked hydrophilic polymer.
2. fiber web as claimed in claim 1, the additional content of wherein said cross-linked hydrophilic polymer in described zone by the described fibroreticulate weight that does not contain described polymer less than 30%.
3. as each described fiber web in claim 1 or 2, at least a portion chemical graft of wherein said cross-linked hydrophilic polymer comprises at least a portion of fiber to described fibroreticulate described zone.
4. the described fiber web of each claim as described above, wherein said fibroreticulate described regional also comprises surfactant.
5. fiber web as claimed in claim 4, wherein said surfactant are the comonomer that described hydrophilic polymer comprised.
6. the described fiber web of each claim as described above, the wherein said fibroreticulate described regional wet thoroughly time of liquid that the 5th time liquid is gushed out was less than 5 seconds.
7. the described fiber web of each claim as described above, wherein the surface tension of the aqueous fluid that rinses out from the described zone that described fiber web comprised is 65mN/m at least.
8. the described fiber web of each claim as described above, wherein said hydrophilic polymer is by monomer polymerization, and at least a portion of wherein said monomer comprises at least one unsaturated double-bond.
9. fiber web as claimed in claim 8, wherein said monomer comprise (methyl) acrylic acid or its salt.
10. fiber web as claimed in claim 9, wherein said (methyl) acrylic acid is neutralized in 70% to 99% scope.
11. the described fiber web of each claim as described above, the described fiber web that does not wherein contain described cross-linked hydrophilic polymer has 5g/m 2To 200g/m 2Basic weight.
12. the described fiber web of each claim as described above, the described fiber web that does not wherein contain described cross-linked hydrophilic polymer has 8g/m 2To 15g/m 2Basic weight, and by spunbond-melt and spray-melt and spray-spunbond layer (SMMS) forms, described layer is made up of polypropylene (PP).
13. as each described fiber web in the claim 1 to 11, the described fiber web that does not wherein contain described cross-linked hydrophilic polymer has 15g/m 2To 20g/m 2Basic weight and be the spun-bonded fibre net of forming by polypropylene (PP).
14. as each described fiber web in the claim 1 to 11, the described fiber web that does not wherein contain described cross-linked hydrophilic polymer has 40g/m 2To 80g/m 2Basic weight and be the carded web of forming by polyester (PET).
15. as each described fiber web in the claim 1 to 14, wherein said zone has the size that 5cm takes advantage of 10cm.
16. the described fiber web of each claim as described above, wherein said fibroreticulate any zone comprises described cross-linked hydrophilic polymer and has every square metre of described fiber web less than the liquid, aqueous reserve capacity of 100g.
17. one kind is used to handle synthetic nonwoven web to comprise the method for cross-linked hydrophilic polymer, said method comprising the steps of:
A) provide synthetic nonwoven web or plurality of fibers is provided;
B) provide the aqueous solution that comprises hydrophilic monomer, cross-linker molecules and radical polymerization initiator molecule;
C) described fiber web or plurality of fibers are contacted with the described aqueous solution, make the described aqueous solution permeate described fiber web or plurality of fibers;
D) described fiber web/plurality of fibers is exposed to ultraviolet radiation;
Wherein select the concentration of monomer described in the described aqueous solution, make the additional content of described hydrophilic polymer on described nonwoven web or plurality of fibers by the weight of described fiber web that does not contain described polymer or plurality of fibers less than 30%.
18. method as claimed in claim 17, wherein said monomer is included in the described aqueous solution in the concentration by the weight 10% to 70% of the described aqueous solution.
19. as claim 17 or 18 described methods, wherein said corsslinking molecular is included in the described aqueous solution in the concentration by the weight 0.01% to 10% of the described aqueous solution.
20. as each described method in the claim 17 to 19, wherein said initiator molecule is included in the described aqueous solution in the concentration by the weight 0.01% to 5% of described solution.
21. as each described method in the claim 17 to 20, wherein said ultraviolet radiation is carried out under inert atmosphere.
22. as each described method in the claim 17 to 21, wherein said aqueous solution also comprises surfactant.
23. method as claimed in claim 22, wherein said surfactant are comonomer.
24. as claim 22 or 23 described methods, wherein said surfactant is included in the described aqueous solution in the concentration by the weight 0.01% to 30% of described solution.
25. as each described method in the claim 17 to 24, wherein said nonwoven web or plurality of fibers are through additional corona treatment.
26. absorbent article, described absorbent article comprises the egative film and the absorbent core between described top flat and described egative film of the basic permeable topsheet of liquid, the basic impermeable of liquid, and wherein said absorbent article comprises as each described fiber web in the claim 1 to 16.
27. absorbent article as claimed in claim 26, wherein said top flat comprises described fiber web.
28. as claim 26 or 27 described absorbent articles, wherein said absorbent article also comprises acquisition layer, and wherein said acquisition layer comprises described fiber web.
29. as each described absorbent article in the claim 26 to 28, wherein said absorbent article also comprises the core cap that is arranged between described top flat and the described absorbent core, and wherein said core cap comprises described fiber web.
30. an absorbent article that comprises fiber web/plurality of fibers, described fiber web/plurality of fibers is according to as each described method manufacturing in the claim 17 to 25.
CNB2005800090172A 2004-03-29 2005-03-28 Hydrophilic nonwovens with low retention capacity comprising cross-linked hydrophilic polymers Expired - Fee Related CN100482883C (en)

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EP1730345A1 (en) 2006-12-13
WO2005095705A1 (en) 2005-10-13

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